在java中创建一个新对象

Question

此代码之间有什么区别：

import sys
import webbrowser
import random
import time
import os
import subprocess
from PyQt4.QtCore import QSize, QTimer
from PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QWidget, QIcon, QLabel, QPainter, QPixmap, QMessageBox, \
    QAction, QKeySequence


def CloseSC(self):
    msg = QMessageBox()
    msg.setIcon(QMessageBox.Critical)
    msg.setText("This is a message box")
    msg.setInformativeText("This is additional information")
    msg.setWindowTitle("MessageBox demo")
    msg.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)


class MainWindow(QMainWindow, ):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setGeometry(50, 50, 400, 450)
        self.setFixedSize(400, 450)
        self.startUIWindow()

        self.actionExit = QAction(('E&xit'), self)
        self.actionExit.setShortcut(QKeySequence("Ctrl+Q"))
        self.actionExit.triggered.connect(CloseSC)

和这段代码：

    Table table = new Table();